curs_scroll(3X)                                                curs_scroll(3X)

       scroll, scrl, wscrl - scroll a curses window

       #include <curses.h>

       int scroll(WINDOW *win);
       int scrl(int n);
       int wscrl(WINDOW *win, int n);

       The  scroll routine scrolls the window up one line.  This involves mov-
       ing the lines in the window data structure.  As an optimization, if the
       scrolling  region  of  the  window  is  the entire screen, the physical
       screen may be scrolled at the same time.

       For positive n, the scrl and wscrl routines  scroll  the  window  up  n
       lines  (line  i+n becomes i); otherwise scroll the window down n lines.
       This involves moving the lines in the window character image structure.
       The current cursor position is not changed.

       For these functions to work, scrolling must be enabled via scrollok.

       These routines return ERR upon failure, and OK (SVr4 only specifies "an
       integer value other than ERR") upon successful completion.

       Note that scrl and scroll may be macros.

       The  SVr4  documentation  says  that  the  optimization  of  physically
       scrolling  immediately  if  the scroll region is the entire screen "is"
       performed, not "may be" performed.   This  implementation  deliberately
       does  not guarantee that this will occur, to leave open the possibility
       of smarter optimization of multiple scroll actions on the next  update.

       Neither  the SVr4 nor the XSI documentation specify whether the current
       attribute or current color-pair of blanks generated by the scroll func-
       tion is zeroed.  Under this implementation it is.

       The XSI Curses standard, Issue 4 describes these functions.

       curses(3X), curs_outopts(3X)